Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 737, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/737/1/L24
Keywords
supernovae: general; supernovae: individual (SNe 2003fg, 2006gz, 2007if, 2009dc); white dwarfs
Categories
Funding
- NASA [HF-51261.01-A, NAS 5-26555]
- HEASARC Online Service
- Alfred P. Sloan Foundation
- National Science Foundation [AST-0707982, AST-0908816]
- U.S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- National Geographic Society
- US Government [NAG W-2166]
- David G. Price Fellowship in Astronomical Instrumentation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0908816] Funding Source: National Science Foundation
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We discuss the emerging trend that super-Chandrasekhar Type Ia Supernovae (SCSNe) with progenitor mass estimates significantly exceeding similar to 1.4 M-circle dot tend to explode in metal-poor environments. While Taubenberger et al. noted that some of the SCSNe host galaxies are relatively metal-poor, we focus quantitatively on their locations in the hosts to point out that in three out of four cases, the SCSNe explosions occurred in the outer edge of the disks of their hosts. It is therefore very likely that their progenitors had far lower metallicities than those implied by the metallicity of their hosts' central regions. In two cases (SN 2003fg and SN 2009dc) the explosion sites were outside similar to 99% of the host's light, and in one case (SN 2006gz) the host's radial metallicity slope indicates that the explosion site is in a metal-poor region. The fourth case (SN 2007if) has the lowest spectroscopically measured SN Ia host metallicity (Childress et al. 2011). It may be possible to explain each of these unusually bright events through some progenitor scenario specific to that case, but a much simpler and straightforward conclusion would be to ascribe the controlling factor to the only physical aspect they have in common-metal-poor environments.
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